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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd79468cb175a965a6965ed5a91cf9d4197a77762e165f45608de3329deaf6ac7' 
  AND token = 'uIY722Ej7HKaFKqz7mcIAC7PWTgBHBGY81q0f0P+DFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}